Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3aee8296ac6e9c6737aee39719785fa4c390feb5828827b9689286ba0b188f1' 
  AND token = 'AVedhPFoNxiVUV5rVJCfW7vxCNADwC4/14vu1pN+4SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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