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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7fe9ced6a22eb7e484526061a4d4d3212fa6ef9d4e9cf12be5a203aea776e0cc' 
  AND token = '2eCxf+6jNd/K0GQg8b/Ie73t+cSHWJhHFYA4iN3tJRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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