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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '409d5b972c0f3aec6290836ca3ff2f87a4e3f6681000c3ed1955026fb6d7033a' 
  AND token = 'u6vCytFGoi13bs4aUi12rsL1SytR82LyuMHIb7z+yyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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