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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '107f8fcf43c8c0e1cb94ccd2b50995935a29a33758c88c07082b5c3720f6033b' 
  AND token = 'kteYCjU51K6Q92EhY5zxSwolzHTt1E/+RcD2tqVS5mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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