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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b1c8c7d037407c76608b74ea5072a36f7cd8ffa23eba4771122b1a819de88fc5' 
  AND token = 'hlmLpyJcUpgzyb+R2mbX9XnNPbOZLRQ2QWX0uXMSy38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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