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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd471c5a665246fca11429ce911ea0774111ce102e1a8ed6a649308cfee2a905e' 
  AND token = 'YF4LV0pauhHpgVQM9gDEoNk+LRxE/l7v47TQcPi4F0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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