Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d87bf16ca2f1e587da5d9775ac3d32e650d5a1acde079f7d0a5a45bf8cb980' 
  AND token = 'mtlhcEPJtV+emMCoUj0Mv5Bhymm8StVzt333NtssI3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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