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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7e4c6bc317ee13ae40ce518c221d4db93e989666faeefa9f092295e182345ca1' 
  AND token = '6L8szAUPTv0eeQWy6j5t4ntKqnm3kOjcMyZJw7haWxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}