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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f76fc8630bc2b64b5d76f8404d947de1e8c299d7b716214cd89e3a752a2e9960' 
  AND token = 'CmzvrIeIUFEtOypKJbnsQDRQNYZoibZL3Wvlr/uAE0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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