Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d56da989ff867a2cf2bcf86729bf9e02e2d603f31fbaadebd1ddc891661cb0' 
  AND token = 'Kff6rg7Kxlkh2eI1MX0/ZwhAqam0cfC3tnIYmXLJ4NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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