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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '09761a3531279732f68d8cb7dd75fa1e9d8846eee1b65b68d68ff7ea1582d044' 
  AND token = 'e+SwFH8EQSzSWZHkabSLMPFOu5BbH+CbpAkCxGaETyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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