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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c16e06f535e4762f29fa34af3e319fc735a3fa2edc4433075f7e1c79b4393a4a' 
  AND token = 'VLnTdj34j3WYCbjr9Tii8u1SM96zkOSN2VNMKgDkQtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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