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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '15fad4dee55763598b19a4fd9287effd76a8b41624aca031c14fe01799532b5a' 
  AND token = 'Vpa0teCg370rAwY7jOW8w993mD3EVa+06fsGsFj+h5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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