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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9e564c2ce354f4477dbaea1bde847d08ad4504018d20232964e7a6e9175dd07a' 
  AND token = 'xzVzM3zp/cXDaK3gyr+GV5h5Ky2gOoWeo6p7Lp2UZXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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