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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '237094ecf782ce46dbe3aff83d88d806a8fe56a612e8ade29b834542f979477d' 
  AND token = 'opcL3KZjha/iB7amS2crAdBpiqQraGKtwMMhO+AYZLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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