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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '993b44a0cef50f8def90db604774b903a3cdb83df7dc769ac8122c266eed10b8' 
  AND token = 'e5As2fFMgbAIVQ71SsHPR6zzYpSJ5IwgHcEMWnfSuko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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