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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '17070f8654f83041c8d5d9d7cedec24bf1502dbe3245876fdf0efb86c9ff7d2a' 
  AND token = 'BapxA0UhenSROFx+potOSAj1un9YwZX3skYM76uXf8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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