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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2bbc121f780de0051d849cb6db306711c051a0fddbadd663b79e99db4178eef4' 
  AND token = '8AldAHkRiP0QyWonNGM9zlwNGCxm/yKgnZeoK0H4Q9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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