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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bb5b18006089b33d21c7cd78e872f151b745ae2e784fa1d8454bdfba3291c9ea' 
  AND token = 'aZpLcP80h7dkHokxtqLfC2nmPyDOfz4SzArduIw7MP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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