Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0276c473b709499c91d69cf40f6aca6f510ed00fde3c09dc7ba9015ab5d1bbcb' 
  AND token = 'ArZfCCiY8sWz50MI147KZKNoPNygk3yWBEOTIJGo+ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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