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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6b6f679017e39cf86518316801f5f7ec5c0213651b3c2fa5001990dd0ff7e188' 
  AND token = 'clFDXEYT3dxgQA0bppt+zL7cVownVBgFAbgcQFFClPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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