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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4e6a0d9941218abc7ae9a0fede8f35ba11dddc16a2b29ead7d188316df38ec31' 
  AND token = 'JWDQrDO409MXMGsC665swgIyshjFqbt+eJ4+Pv0ud9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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