SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '288682717af088fcd97bcda4cda4948a4e339f967f0e1ad5985d9bccb2033016' 
  AND token = 'v1hQ1gDpzzhpINWzr22VxeOcFClzBPOjA0xIx9XlNO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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