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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aaf919cc4ff50e7a17d09581030f133ef863ed39b9662aba80df44d1a86aa106' 
  AND token = 'U8bpA/HXTFbzasS1KmXJPug5JsQL5T3xhZpK0TfXYfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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