SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '72fe35bf5ed2ca6062705af0604bd91d0acb92b129c9747a948343e43ab4185c' 
  AND token = 'AdG5AmAPtaOvxOFTNK+BcEzegujhJF9ZSGueN0i73JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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