Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900f9de30cac81bf2feb79573f10c0d39f76aa561760d4e513322376874c062b' 
  AND token = 'MgK38Cp3NDEEWK2+45FFG6X6tt6pjCscDdsprhIF6hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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