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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8538bf09b1156726f89f9d67383368b27ae81e1db04ca805c4c976751c41f6d6' 
  AND token = 'plulfiSmCTxptG1h8Hdf2rvDWLTcf4H6Mi1J8U74WR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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