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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6041bc4db4ccabe6851a4a2a1d0562eaa8e6f32a65e9623e76c1ac3eb836114a' 
  AND token = 'SyTzc1FD6+IMi2WIKTYVRx2UevT/KeM38QzzxBwP9Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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