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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f71d42b51648767bde795fab2f2c77404d2d1896467507a5811cb5306e2cabc6' 
  AND token = 'qJS8GKE4ETuM1fY4Jvm0tzFcNt7IYTBX5CQ9w57D104=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00185

JSON explain

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