Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cf1f7da04f2cfc65c792fec046fef4d17f667bdaf62b557506385a7214e217a' 
  AND token = '5rjd+EIpSp+/A+Irl2zrk70WRfhqlz0bhc4SaKPRSR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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