Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a2efe7d51012766fa6c37821acc2371d793be18646a501c77cbe9f84d0601b' 
  AND token = '6xrbIRQyA7ogOW/XIGqBsUwiI3uRjdPje+EtJxPW3Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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