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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f0423858218dcdd785df2461f45e6187f2156c2f50297e04a5cd8bbfaa298455' 
  AND token = 'fvS4GyDElI+/ShIz7wZh7iOle9DSIKsOWLAFkLW33TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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