Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ddd7b715d413506757fcb37e776630dad98d45972f3c8675400eb8569e99896' 
  AND token = 'PAiZrYPkbJOoXd8hfO/L/7LIgTgO9MZNaQrhSVy77bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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