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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd9fd7fa8eb9e7dcf9798d20dea8881dc72cec6607e38407217b15e077eb5e409' 
  AND token = 'EddHEwFIgQZNxfdPjmlrK2Np5jLkgsIu3ODvGPnW4A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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