Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a8b0d4f85a7dacbe18ffafa1c9af8e0bef09e77750675cd76e51d765f7e5798' 
  AND token = 'MEH+TWM6a9F/y5ROMYAqk2X4GRjmTf6FjiDcqIPboyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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