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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c7afddb7c6d84d8ed1a9e99b74dc3bdce6a5ac79a95b0fdb7b4e4b05cf381be0' 
  AND token = 'x0PrqWz/vjZ7PJJju2Skknwb8760Ox9O/RWIJlyIf6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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