SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f4f1d808cb4b835ba479d556b8651277a2c3b1ce26b71f7a830e209dc9b96aca' 
  AND token = 'akpwv2dqLSk/4Sjxr+8YdQw5EOANJfHehkoq2wySrq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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