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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cd4e62ab50cb0975b0022ce2c4514f6e752e263440df9d9885782739d470f8ff' 
  AND token = 'Wzpt4oKP2w7NFb2tPyUV9dvvyKG8nzA0pvbRydc5nvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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