Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93988a37dfe0e2e0a1d27735de78771f1046fc00c7d6f1c5d25ff1d3995788d2' 
  AND token = 'y1kGfoMgRcNflRappzgd4al4TkLnY8wmijigaPrKWic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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