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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5c874ec458f01a12778b443b0eefcbf00faa26be189db0e5f83e954b214f3dea' 
  AND token = 'aVrxbH7cNssHcbjxaBqkrcQ54DTUQrXXgBEVXwvKB4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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