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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '93146bb115a33528dc0081b9a340f0d552e44d9c9d7a965515706c88b11eeae4' 
  AND token = 'bJJey5NDhtAFiz08LY9+hWzF8F+FmZtaVMPK3bLv6S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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