SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd57586404779176d6c3ec5bdbc4df1efe2ae0cc9c44193f7bf8258f9e73beb01' 
  AND token = 'RVnEXyZLOPNpqx3KckQIE+RoSAln0mkolJR/R7KBrEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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