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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f98227ab57eb98b190882210da8b1b2acbfbbbb04c52c21bc4e04fe7a2c50bc6' 
  AND token = 'xXM25twL+LBPtetIi0mR5Zg9YYJ1ccSkAcQ8WKo0RDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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