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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '319f5030e523fe21c31ef4420677f899921844226ba9a62ac32230ee18dea538' 
  AND token = 'mPcOPBA6ZTW25NGN9EaKQT7vW79NdUWmqHP7C8KpSJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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