SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0a476fb99fc4fe10b1616443034516a169ff590b87fa806d5c2281b721385c33' 
  AND token = '4n/TyAkxVK3hw8v/0GPTeAYP66a3BphaqkqI7GDdbM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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