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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '596a27f8e501249752ab22c9e1d1e81e154ab737eab4c0ad6f8fed51978cc190' 
  AND token = 'PhbM73Shm0NCw58x8eChk++QK2c/UrJ8JjK5bTSQ0gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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