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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2f1aa239c672ba6696c0eaa382569c6b4c0e3c58a24870d8a8b0cf85fb7905ec' 
  AND token = 'FLOG2kLM5aMH1xF98nSa8Uab5+VZbSuWlQIOp4SBfSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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