Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26434ffe452db4da071f2a872b2a0c7fc9b4c0f323673c0dffc39c4ce20faf68' 
  AND token = 'MJvfNWmpXDbr+RHNj7Re7i0X+a4PUJI62d+NE20KGXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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