Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6a453c2c811c867ce0935b00a6f46b4b4a0bcb358165d7055a5fa55d76cba36' 
  AND token = 'ha1dV8J14Ns+c87D/kGX9hpjR+r78AsM7GtpXmgGwGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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