SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '56edf535aff13ecffd21163f9e07e053b5c92b8de30ddbc22cc763b53aa134c1' 
  AND token = 'pIUVb/VEKpP/aX4HUdsGCmE+b5g1gYeX78w3Dlhv418=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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