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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c5723d53db0945133b666bbf302067f953e808864c7222b2dd15a7475c5daafa' 
  AND token = 'G4pLaJP2vmffhAoobPRC0N6HzQaKEoIBslpIBNsxyFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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