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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ee990a28964ce5571230bce3180e93bd6e085402e5c395a314a5c066b71891e5' 
  AND token = 'YAjL+4Y4GiIBYlrkm81P3ltkZVMAm0w5dgjISB+kP8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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