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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'e21f1c060f486aef58437dba96e84f349a3908a3a2c6e634c3788da0fe20c53c' 
  AND token = 'mPNrLiL28rFTtpEQXN8Q6ywV7W4u59ohL2nnTwCSbU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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