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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e6c5927933ab0bf52be4f07c600c5f7e1d5520eed1013ee1fa3a84c42bc8f81c' 
  AND token = 'rJkFNxa0Cyzhpw45KqGOXKCni4U+HJKra/x25fyLZJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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