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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a0e7e49069c0579d5f565cc1265a5c5d7ef75b56a55e280588dc40697bbff60b' 
  AND token = '12TeGvMNzuDkNBD/bxq4VLPat1n/f2KiniJJTrL4Ee4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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