Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c493fe1c3423dad6755f29fe8d20e5b42b38eb30e29fa3c1f7d3fb3443f7bc' 
  AND token = 'K38hoWlCiS1nUPullt2eUhLCi7o6Q4Ezb3pgNnn5bto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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