SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '67ce126ea0b539f815640a594df26c4536ca4fa0fd5f59a5834970d4c2768365' 
  AND token = 'IuBZYgcqgu8JT1C3jXrct1Yxk9MLDMZeEKWBth5ACIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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