Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6188f2518247dab707ee5801fa3eaecf7a38b0a3db53d6cfd155f7c9b1a00b1' 
  AND token = 'p+FqqSgsxaG2VUzMcHOLBCFfwxD48pMpqXXufjcuSLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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